Nonlinear Material Models for Winkler-Based Shallow Foundation Response Evaluation

Raychowdhury, P. N.; Hutchinson, Tara C.

doi:10.1061/40972(311)85

Cited by 21 publications

(42 citation statements)

References 5 publications

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“…A minimum of 25 springs (i.e., S = 4%) along the footing length is suggested to provide numerical stability and reasonable accuracy. Shape Parameters ( C r , c , n ) : These parameters are hardwired into the OpenSees implementation of the material models, meaning that they are not specified by users. The recommended values are soil-type dependent and were developed based on comparisons of model predictions to test data as described by Raychowdhury and Hutchinson (2008).…”

Section: Description Of Soil-foundation Modelsmentioning

confidence: 99%

“…That testing provided the basis for the empirical calibration of the relatively subtle (or nonphysical) parameters described earlier in this paper. Selected results and calibrations are described by Gajan and Kutter (2008, 2009) for CIM and Raychowdhury and Hutchinson (2008) and Raychowdhury (2008) for BNWF. Because this information has been documented previously, our discussion is limited to a relatively concise synthesis of the principal response quantities as measured in the centrifuge and as predicted by both models in a consistent format.…”

Section: Comparison Of Model Predictions To Centrifuge Datamentioning

confidence: 99%

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Application and Validation of Practical Tools for Nonlinear Soil-Foundation Interaction Analysis

et al. 2010

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Practical guidelines for characterization of soil-structure interaction (SSI) effects for shallow foundations are typically based on representing foundation-soil interaction in terms of viscoelastic impedance functions that describe stiffness and damping characteristics. Relatively advanced tools can describe nonlinear soil-foundation behavior, including temporary gap formation, foundation settlement and sliding, and hysteretic energy dissipation. We review two tools that describe such effects for shallow foundations and that are implemented in the computational platform OpenSees: a beam-on-nonlinear-Winkler foundation (BNWF) model and a contact interface model (CIM). We review input parameters and recommend parameter selection protocols. Model performance with the recommended protocols is evaluated through model-to-model comparisons for a hypothetical shear wall building resting on clay and model-data comparisons for several centrifuge test specimens on sand. The models describe generally consistent moment-rotation behavior, although shear-sliding and settlement behaviors deviate depending on the degree of foundation uplift. Pronounced uplift couples the moment and shear responses, often resulting in significant shear sliding and settlements. Such effects can be mitigated through the lateral connection of foundation elements with tie beams.

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Section: Description Of Soil-foundation Modelsmentioning

confidence: 99%

Section: Comparison Of Model Predictions To Centrifuge Datamentioning

confidence: 99%

Application and Validation of Practical Tools for Nonlinear Soil-Foundation Interaction Analysis

et al. 2010

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“…e well-known theory of beam on nonlinear Winkler foundation (BNWF) was utilized for modeling the flexibility of the foundation, as used in several studies [29][30][31][32][33][34][35][36][37][38]. e simplicity and capability of the BNWF model in accounting for nonlinear behavior of shallow foundations are its two main beneficial features.…”

Section: Foundation Systemmentioning

confidence: 99%

The Effect of Foundation Flexibility on Probabilistic Seismic Performance of Plan‐Asymmetric Buildings with Different Strength Distributions

Osalu

Shakib

2020

Advances in Civil Engineering

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In this research, the probabilistic seismic performance of asymmetric reinforced concrete wall-frame buildings with different strength distributions incorporating foundation flexibility effects is examined. By using probability-based performance evaluation approach, it is possible to provide a more accurate prediction of the different strength distribution effect on the seismic performance of asymmetric buildings and find the most efficient strength distribution for meeting each performance level. These efficient distributions can be adopted in the performance-based design of asymmetric buildings. For this purpose, first, the regression analysis and the concepts of efficiency and sufficiency were used to determine an optimal intensity measure (IM) for incremental dynamic analysis and evaluating the seismic response of the considered building models. Then, the proper magnitude of interstory drift capacity for this type of buildings in each limit state was estimated using the damage index concept. Finally, the effects of different strength distributions and the flexibility of foundation were studied on the seismic performance of the asymmetric buildings by investigating the mean annual frequencies of exceeding structural performance levels and confidence levels to satisfy performance objectives. It is concluded that irregular distributions of stiffness and strength in the plan of a building highly affect the seismic performance of buildings. Also, the results show that the optimum strength distribution is a function of the objective performance level and these optimum strength distributions are the same for both fixed- and flexible-base conditions. Meanwhile, the flexible effect of foundation increases the mean annual frequencies of exceedance within the range of 10% to 45% and significantly decreases the confidence levels in most cases.

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“…This model is used in this study to simulate nonlinear soil-foundation interaction. The BNWF model is also integrated with the openly available software platform OpenSees (PEER 2008) by Raychowdhury and Hutchinson (2008). BNWF model can characterize the nonlinear, time-dependent behavior of the foundationsoil interface for shallow foundations (footings, mats).…”

Section: Soil-foundation Interactionmentioning

confidence: 99%

Rocking Soil-Structure Systems Subjected to Near-Fault Pulses

Masaeli

Khoshnoudian

Ziaei

2015

Journal of Earthquake Engineering

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Seismic performance of rocking soil-structure systems subjected to near-fault pulses is investigated considering foundation uplifting and soil plasticity. An extensive parametric study is conducted including medium-to-high-rise buildings with different aspect ratios based on shallow raft foundation at stiff-to-rock sites. Mathematical directivity and fling pulses are used as input ground motion. The superstructure is assumed to have three different boundary conditions: (i) fixed-base, (ii) linear soil-structure interaction (SSI), and (iii) nonlinear SSI. Evidently, the prevailing pulse period T p is a key parameter governing nonlinear SSI effects. The normalized acceleration response spectra reveal that despite beneficial effects of foundation uplifting and soil yielding in most cases, there are some minor regions in which the response accelerations are amplified. In addition, more slender buildings significantly benefit from uplifting and soil yielding when subjected to short-and medium-period directivity pulses compared to squat structures. However, response amplifications with respect to fixed-base structures are Downloaded by [Gazi University] at 21:38 04 February 2015A c c e p t e d M a n u s c r i p t 2 considerable in case of slender structures subjected to medium-or long-period directivity pulses.So that neglecting the SSI effects on seismic performance of rocking structures with shallow foundations, as mostly assumed in common practice, may give rise to inaccurate estimations of force demands against near-fault pulselike ground motions. Furthermore, the envelope of residual foundation tilting θ r is limited to 0.015 rad. in case of directivity pulses.

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Nonlinear Material Models for Winkler-Based Shallow Foundation Response Evaluation

Cited by 21 publications

References 5 publications

Application and Validation of Practical Tools for Nonlinear Soil-Foundation Interaction Analysis

Application and Validation of Practical Tools for Nonlinear Soil-Foundation Interaction Analysis

The Effect of Foundation Flexibility on Probabilistic Seismic Performance of Plan‐Asymmetric Buildings with Different Strength Distributions

Rocking Soil-Structure Systems Subjected to Near-Fault Pulses

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